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President Obama on Wednesday nominated Carla Hayden to be the new librarian of Congress — potentially marking the first leadership switch in nearly 30 years as criticism has mounted over the organization's technology policies. 

Hayden, currently the chief executive of the Enoch Pratt Free Library in Baltimore, served as the president of the American Library Association more than a decade ago. If confirmed, she would be the first woman and first African-American to hold the position. 

There have only been 13 previous librarians.